1 -- Minetest: builtin/misc_helpers.lua
3 --------------------------------------------------------------------------------
4 -- Localize functions to avoid table lookups (better performance).
5 local string_sub, string_find = string.sub, string.find
7 --------------------------------------------------------------------------------
10 if tp == "number" then
12 elseif tp == "string" then
13 return string.format("%q", o)
14 elseif tp == "boolean" then
16 elseif tp == "nil" then
18 -- Uncomment for full function dumping support.
19 -- Not currently enabled because bytecode isn't very human-readable and
20 -- dump's output is intended for humans.
21 --elseif tp == "function" then
22 -- return string.format("loadstring(%q)", string.dump(o))
24 return string.format("<%s>", tp)
38 ["goto"] = true, -- Lua 5.2
52 local function is_valid_identifier(str)
53 if not str:find("^[a-zA-Z_][a-zA-Z0-9_]*$") or keywords[str] then
59 --------------------------------------------------------------------------------
60 -- Dumps values in a line-per-value format.
61 -- For example, {test = {"Testing..."}} becomes:
63 -- _["test"][1] = "Testing..."
64 -- This handles tables as keys and circular references properly.
65 -- It also handles multiple references well, writing the table only once.
66 -- The dumped argument is internal-only.
68 function dump2(o, name, dumped)
70 -- "dumped" is used to keep track of serialized tables to handle
71 -- multiple references and circular tables properly.
72 -- It only contains tables as keys. The value is the name that
73 -- the table has in the dump, eg:
74 -- {x = {"y"}} -> dumped[{"y"}] = '_["x"]'
76 if type(o) ~= "table" then
77 return string.format("%s = %s\n", name, basic_dump(o))
80 return string.format("%s = %s\n", name, dumped[o])
83 -- This contains a list of strings to be concatenated later (because
84 -- Lua is slow at individual concatenation).
86 for k, v in pairs(o) do
88 if type(k) == "table" then
92 -- Key tables don't have a name, so use one of
93 -- the form _G["table: 0xFFFFFFF"]
94 keyStr = string.format("_G[%q]", tostring(k))
96 t[#t + 1] = dump2(k, keyStr, dumped)
99 keyStr = basic_dump(k)
101 local vname = string.format("%s[%s]", name, keyStr)
102 t[#t + 1] = dump2(v, vname, dumped)
104 return string.format("%s = {}\n%s", name, table.concat(t))
107 --------------------------------------------------------------------------------
108 -- This dumps values in a one-statement format.
109 -- For example, {test = {"Testing..."}} becomes:
115 -- This supports tables as keys, but not circular references.
116 -- It performs poorly with multiple references as it writes out the full
118 -- The indent field specifies a indentation string, it defaults to a tab.
119 -- Use the empty string to disable indentation.
120 -- The dumped and level arguments are internal-only.
122 function dump(o, indent, nested, level)
123 if type(o) ~= "table" then
126 -- Contains table -> true/nil of currently nested tables
127 nested = nested or {}
129 return "<circular reference>"
132 indent = indent or "\t"
135 local dumped_indexes = {}
136 for i, v in ipairs(o) do
137 t[#t + 1] = dump(v, indent, nested, level + 1)
138 dumped_indexes[i] = true
140 for k, v in pairs(o) do
141 if not dumped_indexes[k] then
142 if type(k) ~= "string" or not is_valid_identifier(k) then
143 k = "["..dump(k, indent, nested, level + 1).."]"
145 v = dump(v, indent, nested, level + 1)
146 t[#t + 1] = k.." = "..v
151 local indent_str = "\n"..string.rep(indent, level)
152 local end_indent_str = "\n"..string.rep(indent, level - 1)
153 return string.format("{%s%s%s}",
155 table.concat(t, ","..indent_str),
158 return "{"..table.concat(t, ", ").."}"
161 --------------------------------------------------------------------------------
162 function string.split(str, delim, include_empty, max_splits, sep_is_pattern)
164 max_splits = max_splits or -1
166 local pos, len, seplen = 1, #str, #delim
167 local plain = not sep_is_pattern
168 max_splits = max_splits + 1
170 local np, npe = string_find(str, delim, pos, plain)
171 np, npe = (np or (len+1)), (npe or (len+1))
172 if (not np) or (max_splits == 1) then
176 local s = string_sub(str, pos, np - 1)
177 if include_empty or (s ~= "") then
178 max_splits = max_splits - 1
179 items[#items + 1] = s
182 until (max_splits == 0) or (pos > (len + 1))
186 --------------------------------------------------------------------------------
187 function table.indexof(list, val)
188 for i, v in ipairs(list) do
196 assert(table.indexof({"foo", "bar"}, "foo") == 1)
197 assert(table.indexof({"foo", "bar"}, "baz") == -1)
199 --------------------------------------------------------------------------------
200 function file_exists(filename)
201 local f = io.open(filename, "r")
210 --------------------------------------------------------------------------------
211 function string:trim()
212 return (self:gsub("^%s*(.-)%s*$", "%1"))
215 assert(string.trim("\n \t\tfoo bar\t ") == "foo bar")
217 --------------------------------------------------------------------------------
218 function math.hypot(x, y)
224 if x == 0 then return 0 end
226 return x * math.sqrt(1 + t * t)
229 --------------------------------------------------------------------------------
230 function math.sign(x, tolerance)
231 tolerance = tolerance or 0
232 if x > tolerance then
234 elseif x < -tolerance then
240 --------------------------------------------------------------------------------
241 -- Video enums and pack function
245 zero = 0, -- src & dest (0, 0, 0, 0)
246 one = 1, -- src & dest (1, 1, 1, 1)
247 dst_color = 2, -- src (destR, destG, destB, destA)
248 one_minus_dst_color = 3, -- src (1-destR, 1-destG, 1-destB, 1-destA)
249 src_color = 4, -- dest (srcR, srcG, srcB, srcA)
250 one_minus_src_color = 5, -- dest (1-srcR, 1-srcG, 1-srcB, 1-srcA)
251 src_alpha = 6, -- src & dest (srcA, srcA, srcA, srcA)
252 one_minus_src_alpha = 7, -- src & dest (1-srcA, 1-srcA, 1-srcA, 1-srcA)
253 dst_alpha = 8, -- src & dest (destA, destA, destA, destA)
254 one_minus_dst_alpha = 9, -- src & dest (1-destA, 1-destA, 1-destA, 1-destA)
255 src_alpha_saturate = 10,-- src (min(srcA, 1-destA), idem, ...)
272 -- BlendFunc = source * sourceFactor + dest * destFactor
273 function minetest.pack_texture_blend_func(srcFact, dstFact, modulate, alphaSource)
274 return alphaSource * 4096 + modulate * 256 + srcFact * 16 + dstFact
277 --------------------------------------------------------------------------------
278 function get_last_folder(text,count)
279 local parts = text:split(DIR_DELIM)
287 retval = retval .. parts[#parts - (count-i)] .. DIR_DELIM
293 --------------------------------------------------------------------------------
294 function cleanup_path(temppath)
296 local parts = temppath:split("-")
299 if temppath ~= "" then
300 temppath = temppath .. "_"
302 temppath = temppath .. parts[i]
305 parts = temppath:split(".")
308 if temppath ~= "" then
309 temppath = temppath .. "_"
311 temppath = temppath .. parts[i]
314 parts = temppath:split("'")
317 if temppath ~= "" then
318 temppath = temppath .. ""
320 temppath = temppath .. parts[i]
323 parts = temppath:split(" ")
326 if temppath ~= "" then
329 temppath = temppath .. parts[i]
335 function core.formspec_escape(text)
337 text = string.gsub(text,"\\","\\\\")
338 text = string.gsub(text,"%]","\\]")
339 text = string.gsub(text,"%[","\\[")
340 text = string.gsub(text,";","\\;")
341 text = string.gsub(text,",","\\,")
347 function core.splittext(text,charlimit)
350 local current_idx = 1
352 local start,stop = string_find(text, " ", current_idx)
353 local nl_start,nl_stop = string_find(text, "\n", current_idx)
354 local gotnewline = false
355 if nl_start ~= nil and (start == nil or nl_start < start) then
361 while start ~= nil do
362 if string.len(last_line) + (stop-start) > charlimit then
363 retval[#retval + 1] = last_line
367 if last_line ~= "" then
368 last_line = last_line .. " "
371 last_line = last_line .. string_sub(text, current_idx, stop - 1)
374 retval[#retval + 1] = last_line
380 start,stop = string_find(text, " ", current_idx)
381 nl_start,nl_stop = string_find(text, "\n", current_idx)
383 if nl_start ~= nil and (start == nil or nl_start < start) then
390 --add last part of text
391 if string.len(last_line) + (string.len(text) - current_idx) > charlimit then
392 retval[#retval + 1] = last_line
393 retval[#retval + 1] = string_sub(text, current_idx)
395 last_line = last_line .. " " .. string_sub(text, current_idx)
396 retval[#retval + 1] = last_line
402 --------------------------------------------------------------------------------
404 if INIT == "game" then
405 local dirs1 = {9, 18, 7, 12}
406 local dirs2 = {20, 23, 22, 21}
408 function core.rotate_and_place(itemstack, placer, pointed_thing,
409 infinitestacks, orient_flags)
410 orient_flags = orient_flags or {}
412 local unode = core.get_node_or_nil(pointed_thing.under)
416 local undef = core.registered_nodes[unode.name]
417 if undef and undef.on_rightclick then
418 undef.on_rightclick(pointed_thing.under, unode, placer,
419 itemstack, pointed_thing)
422 local fdir = core.dir_to_facedir(placer:get_look_dir())
423 local wield_name = itemstack:get_name()
425 local above = pointed_thing.above
426 local under = pointed_thing.under
427 local iswall = (above.y == under.y)
428 local isceiling = not iswall and (above.y < under.y)
429 local anode = core.get_node_or_nil(above)
433 local pos = pointed_thing.above
436 if undef and undef.buildable_to then
437 pos = pointed_thing.under
442 if core.is_protected(pos, placer:get_player_name()) then
443 core.record_protection_violation(pos,
444 placer:get_player_name())
448 local ndef = core.registered_nodes[node.name]
449 if not ndef or not ndef.buildable_to then
453 if orient_flags.force_floor then
456 elseif orient_flags.force_ceiling then
459 elseif orient_flags.force_wall then
462 elseif orient_flags.invert_wall then
467 core.set_node(pos, {name = wield_name,
468 param2 = dirs1[fdir + 1]})
469 elseif isceiling then
470 if orient_flags.force_facedir then
471 core.set_node(pos, {name = wield_name,
474 core.set_node(pos, {name = wield_name,
475 param2 = dirs2[fdir + 1]})
477 else -- place right side up
478 if orient_flags.force_facedir then
479 core.set_node(pos, {name = wield_name,
482 core.set_node(pos, {name = wield_name,
487 if not infinitestacks then
488 itemstack:take_item()
494 --------------------------------------------------------------------------------
495 --Wrapper for rotate_and_place() to check for sneak and assume Creative mode
496 --implies infinite stacks when performing a 6d rotation.
497 --------------------------------------------------------------------------------
500 core.rotate_node = function(itemstack, placer, pointed_thing)
501 core.rotate_and_place(itemstack, placer, pointed_thing,
502 core.setting_getbool("creative_mode"),
503 {invert_wall = placer:get_player_control().sneak})
508 --------------------------------------------------------------------------------
509 function core.explode_table_event(evt)
511 local parts = evt:split(":")
513 local t = parts[1]:trim()
514 local r = tonumber(parts[2]:trim())
515 local c = tonumber(parts[3]:trim())
516 if type(r) == "number" and type(c) == "number"
518 return {type=t, row=r, column=c}
522 return {type="INV", row=0, column=0}
525 --------------------------------------------------------------------------------
526 function core.explode_textlist_event(evt)
528 local parts = evt:split(":")
530 local t = parts[1]:trim()
531 local r = tonumber(parts[2]:trim())
532 if type(r) == "number" and t ~= "INV" then
533 return {type=t, index=r}
537 return {type="INV", index=0}
540 --------------------------------------------------------------------------------
541 function core.explode_scrollbar_event(evt)
542 local retval = core.explode_textlist_event(evt)
544 retval.value = retval.index
550 --------------------------------------------------------------------------------
551 function core.pos_to_string(pos, decimal_places)
555 if decimal_places ~= nil then
556 x = string.format("%." .. decimal_places .. "f", x)
557 y = string.format("%." .. decimal_places .. "f", y)
558 z = string.format("%." .. decimal_places .. "f", z)
560 return "(" .. x .. "," .. y .. "," .. z .. ")"
563 --------------------------------------------------------------------------------
564 function core.string_to_pos(value)
570 p.x, p.y, p.z = string.match(value, "^([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+)$")
571 if p.x and p.y and p.z then
578 p.x, p.y, p.z = string.match(value, "^%( *([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+) *%)$")
579 if p.x and p.y and p.z then
588 assert(core.string_to_pos("10.0, 5, -2").x == 10)
589 assert(core.string_to_pos("( 10.0, 5, -2)").z == -2)
590 assert(core.string_to_pos("asd, 5, -2)") == nil)
592 --------------------------------------------------------------------------------
593 function core.string_to_area(value)
594 local p1, p2 = unpack(value:split(") ("))
595 if p1 == nil or p2 == nil then
599 p1 = core.string_to_pos(p1 .. ")")
600 p2 = core.string_to_pos("(" .. p2)
601 if p1 == nil or p2 == nil then
608 local function test_string_to_area()
609 local p1, p2 = core.string_to_area("(10.0, 5, -2) ( 30.2, 4, -12.53)")
610 assert(p1.x == 10.0 and p1.y == 5 and p1.z == -2)
611 assert(p2.x == 30.2 and p2.y == 4 and p2.z == -12.53)
613 p1, p2 = core.string_to_area("(10.0, 5, -2 30.2, 4, -12.53")
614 assert(p1 == nil and p2 == nil)
616 p1, p2 = core.string_to_area("(10.0, 5,) -2 fgdf2, 4, -12.53")
617 assert(p1 == nil and p2 == nil)
620 test_string_to_area()
622 --------------------------------------------------------------------------------
623 function table.copy(t, seen)
627 for k, v in pairs(t) do
628 n[(type(k) == "table" and (seen[k] or table.copy(k, seen))) or k] =
629 (type(v) == "table" and (seen[v] or table.copy(v, seen))) or v
633 --------------------------------------------------------------------------------
634 -- mainmenu only functions
635 --------------------------------------------------------------------------------
636 if INIT == "mainmenu" then
637 function core.get_game(index)
638 local games = game.get_games()
640 if index > 0 and index <= #games then
647 function fgettext_ne(text, ...)
648 text = core.gettext(text)
649 local arg = {n=select('#', ...), ...}
651 -- Insert positional parameters ($1, $2, ...)
654 while pos <= text:len() do
655 local newpos = text:find('[$]', pos)
656 if newpos == nil then
657 result = result .. text:sub(pos)
661 tonumber(text:sub(newpos+1, newpos+1))
662 result = result .. text:sub(pos, newpos-1)
663 .. tostring(arg[paramindex])
672 function fgettext(text, ...)
673 return core.formspec_escape(fgettext_ne(text, ...))